Shure BLX Wireless Mic System with SM31FH Fitness Headset Microphone — AV Now Fitness Sound
SM31 FH- Shure Fitness Headset - can be adapted to other brands – bodymics
Shure Wireless Headset System & Mic – Fitness AV
Amazon.com: Shure BLX14/SM31 Wireless Microphone System with BLX4 Receiver, BLX1 Bodypack Transmitter and SM31FH Fitness Headset Condenser Mic with Moisture-Repellent Cartridge for Workout Instructors - H9 Band : Musical Instruments